Facebook also said it has made it simpler to assign the same tags to multiple photos of the same event or person. The photo viewer got a makeover: it pops up in the middle of the screen, as opposed to in a separate page, and flipping through the images is faster.

Facebook members have uploaded tens of billions of images to the social network. In July, Facebook ranked as the largest photo sharing site in the U.S. with 98.5 million unique visitors to its photo sections, way ahead of Photobucket, which ranked second with 27.4 million, according to comScore.

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